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The stuff sack Clark includes is attached at the bottom of the pocket on a sufficiently generous piece of fabric. It is a fine one, with velcro closure and handles.

No reason the ends of it cannot be cut and stitched to work as a speed sack, too.
In answer to the question: Size of sack would depend on how much you wish to stuff. I can compress an NX250 and rain fly by at least a third.

Motivated by your question, I just stuffed an NX250 with a 14oz down 3/4 20F UQ into the Clark sack. (Equivalently, could have been a 40F rated top quilt.)
Tight, yes, but it fits. Size? Roughly 13 long X 8 X 7 = 700cu in ~ 12l

The stuff sack Clark includes is attached at the bottom of the pocket on a sufficiently generous piece of fabric. It is a fine one, with velcro closure and handles.

No reason the ends of it cannot be cut and stitched to work as a speed sack, too.
In answer to the question: Size of sack would depend on how much you wish to stuff. I can compress an NX250 and rain fly by at least a third.

Motivated by your question, I just stuffed an NX250 with a 14oz down 3/4 20F UQ into the Clark sack. (Equivalently, could have been a 40F rated top quilt.)
Tight, yes, but it fits. Size? Roughly 13 long X 8 X 7 = 700cu in ~ 12l

No, that was the NX-250 with its rainshield and bugnet + suspension + UQ. If I added buttons to the sack to secure it, a tarp would have fit, as there was another 1-2" of the velcro patch available. But a wet tarp + down?

For browsers: That's the largest Clark hammock with its weather-shield. I can't check now, but I believe Clark uses the same stuff sack for all its hammocks. So smaller Clarks and those without a weather-shield should be able to pack more.

Lost in my previous comment was the observation that the included stuff sack is not sewn to the bottom of one pocket , but instead onto a 1-2" flap of nylon cloth that goes to the pockets bottom. It is as though Clark invites you to cut it that flap in the middle and easily re-attach the bag by sewing if you change your mind or habits